1、ICS 23.040.60Ltlose Rohrverschraubungen mit Schneidring Einschraubstutzender Reihe LL mit kegeligem EinschraubgewindeIn keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal marker.ForewordThis
2、 standard has been prepared by the Normenausschuss Rohrleitungen und Dampfkesselanlagen(Pipelines and Pressure Vessels Standards Committee).AmendmentsThis standard differs from the April 1984 edition as follows:a) The standard now only covers couplings rated for nominal pressures up to 100 bar.b) Th
3、e specifications for surface roughness and finish have been amended.c) The standard has been editorially revised.Previous editionsDIN 3900: 1957-06, 1966-10, 1984-04.Ref. No. DIN 3900 : 2001-06English price group 05 Sales No. 010505.02DEUTSCHE NORM June 20013900Continued on pages 2 and 3. No part of
4、 this translation may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).Compression couplings (LL series) withtapered stud endTranslation by DIN-Spra
5、chendienst.In case of doubt, the German-language original should be consulted as the authoritative text.Supersedes April 1984 edition.All dimensions are in millimetres.1 ScopeThis standard specifies the design and dimensions of extra-light duty series (LL) compression couplings withtapered stud end
6、and with type W port as in DIN 3861, rated for nominal pressures up to 100 bar, for use incompression coupling assemblies.In combination with type X tapped holes as in DIN 3852-1 or DIN 3852-2, tapered stud ends as specified hereare interchangeable with series LL, type A stud ends as in DIN 3901.NOT
7、E: Tightness of the assembly cannot be guaranteed since this is a function of the medium conveyed,the working pressure and temperature, and the combination of materials used. Therefore, when designingcompression couplings as specified in this standard, use of a seal is recommended.Page 2DIN 3900 : 2
8、001-062 Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. These normativereferences are cited at the appropriate places in the text, and the titles of the publications are listed below. Fordated references, subsequent amendments to or
9、revisions of any of these publications apply to this standardonly when incorporated in it by amendment or revision. For undated references, the latest edition of thepublication referred to applies.DIN 158-1 Metric taper external and mating parallel internal screw threads Dimensions, tolerancesand in
10、spectionDIN 3852-1 Stud ends and tapped holes with metric fine pitch thread, for use with compressioncouplings, valves and screw plugs DimensionsDIN 3852-2 Stud ends and tapped holes with pipe thread, for use with compression couplings, valves andscrew plugs DimensionsDIN 3853 Compression couplings
11、Compression ends for coupling nutsDIN 3858 Pipe threads for compression couplings Parallel internal threads and metric taper externalthreads Thread dimensionsDIN 3859-1 Compression fittings and couplings Technical delivery conditionsDIN 3861 Compression rings (ferrules) for use with compression coup
12、lings Design and type Wcompression ends (ports)DIN 3901 Stud fittings with type A stud end as in DIN 3852DIN 24312 Fluid power Pressure: concepts and characteristic valuesDIN EN ISO 4042 Fasteners Electroplated coatings (ISO 4042 : 1999)3 Dimensions and designationDesign details left unspecified in
13、figure 1 shall be selected as appropriate.Key to figure1 Stud end as in DIN 3852-1 or DIN 3852-22 Compression end as in DIN 38533 Type W port as in DIN 3861Figure 1: Dimensions of coupling with tapered stud end (notation)Designation of a compression coupling with stud end with metric thread (M), ext
14、ra-light duty series (LL), madeof steel (St), for an 8 mm pipe outside diameter (8):Coupling DIN 3900 LL 8 M StDesignation of a compression coupling with stud end with pipe thread (R), extra-light duty series (LL), made ofsteel (St), for an 8 mm pipe outside diameter (8):Coupling DIN 3900 LL 8 R St1
15、23Page 3DIN 3900 : 2001-06Table 1: Dimensions of couplings with tapered stud endSeriesPipeNominalType C stud endCompression end details WidthApprox.outsidepressure(as in DIN 3852-1 or(type W port as in acrossmass,diameter(as inDIN 3852-2)DIN 3861) flats, sin kg,DIN 24312)1)with metric with pipeperth
16、read (as in thread (as in100 unitsDIN 158-1) DIN 3858)d2i2d2i2d7i3d9d10 lLL 4 M8 G180 1 keg 8 R1/8 8M8G180 1 8 4 3 20 102) 0,8(extra- 5 M8 G180 1 keg 8 R1/8 8 M10 G180 1 8 5 3,5 20 11 0,9light 6100M10 G180 1 keg 8 R1/8 8 M10 G180 1 8 6 4,5 20 11 0,8duty) 8 M10 G180 1 keg 8 R1/8 8 M12 G180 1 9 8 6 22
17、 12 0,91) Applies only to steel couplings (cf. DIN 3859-1 for technical delivery conditions)2) Width across flats of 11 mm for pipe threads.4 MaterialsThe standard material of couplings with tapered stud end shall be steel as specified in DIN 3859-1. Othermaterials specified in DIN 3859-1 shall be t
18、he subject of agreement, with the relevant symbol being included inthe designation.5 FinishThe standard finish shall be Fe/Zn 8c2C as in DIN EN ISO 4042. Other types of finish (cf. DIN 3859-1) shall bethe subject of agreement, with the relevant symbol being included in the designation.6 Technical delivery conditionsThe technical delivery conditions specified in DIN 3859-1 shall apply.
